JPH0597146U - Wireless telephone device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide an excellent wireless telephone device which is not restricted in the direction of the handset at any position. A master unit including a telephone main body 10 and a wireless unit 20 for performing telephone communication with the outside through a communication line, and a light emission for converting a voice signal output from the master unit into infrared light and emitting the infrared light in a predetermined direction. A unit having a section 40T, a receiving unit that receives infrared light from the light emitting unit 40T and converts the infrared light into a receiving voice signal, and a transmitting unit that converts the transmitting voice signal into infrared light and emits the infrared light, and the child unit. Infrared light emitted from the machine is received in a reception area, converted into a voice signal for reception and supplied to the master machine.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wireless telephone device including a master unit that performs telephone communication via a communication line such as a station line and a dedicated line, and a slave unit that performs telephone communication with the master unit.

[0002]

[Prior Art]

 2. Description of the Related Art A conventional wireless telephone device including a handset, which is a slave device that communicates with a master device by a radio wave modulated with a voice signal, is widely known. However, such a method using modulated radio waves has a drawback that the sound quality is deteriorated due to the inclusion of vehicle ignition noise and other pulse noise, especially in the case of a wireless telephone installed in a vehicle. was there. In addition, there is a drawback in that it is susceptible to interference from devices using the same type of communication system, and conversely gives interference to those devices. Furthermore, since the communication distance is long, there was the drawback of interference. On the other hand, TV remote control devices that operate wirelessly by using infrared light for control, and devices that emit infrared light modulated by a sound signal from a stereo device and receive it with wireless headphones are already available. It is known. Therefore, a method of eliminating the above-mentioned drawbacks by wireless communication is conceivable by a technique for communicating between a master unit and a slave unit of an automobile telephone device using infrared light.

[0003]

[Problems to be solved by the device]

 However, even if a wireless telephone device is constructed with conventional technology that uses infrared light as it is, in the case of a car telephone, for example, the handset must be used in a limited position in the vehicle and with the handset facing in a certain direction. There is a problem that it has to be. In particular, when the driver uses it while driving, it is difficult to keep the direction of the handset constant, and there is a problem that the handset cannot be used in practice.

The present invention solves such a problem and also solves the deficiency of the conventional wireless telephone device. Therefore, the present invention is excellent in that it is not restricted at any position and in the direction of the handset. It is an object to provide a wireless telephone device.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention achieves the above-mentioned object. A master unit that performs telephone communication with the outside through a communication line, and an infrared line that converts a voice signal output from the master unit into infrared light and emits it in a predetermined direction. A handset having a light converting means, a receiving means for receiving the infrared light emitted from the infrared converting means and converting it into a receiving voice signal, and a transmitting means for converting the transmitting voice signal into an infrared light and emitting the infrared light. And a voice signal conversion means for receiving infrared light emitted from the slave unit in the reception area, converting the infrared light into a voice signal for reception and supplying the voice signal to the master unit.

[0006]

[Action]

 With the above-described configuration, the present invention suppresses the influence of noise and eliminates interference with other devices by performing communication using infrared light as a medium between the master unit and the slave unit. Good communication is possible without being restricted to the direction of the handset at any position.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a base unit of a wireless telephone device. In FIG. 1, the telephone main body 10 performs telephone communication via a telephone line such as a station line or a dedicated line via an antenna 11. The wireless unit 20 is connected to the telephone body 10 and sends and receives signals such as a voice signal for transmission, a voice signal for reception, and a call control signal. The wireless unit 20 is composed of a transmitting unit 20T and a receiving unit 20R, and the transmitting unit 20T further includes an audio amplifier 21 that receives a voice signal for transmission from the telephone body 10 and a low frequency audio signal from the audio amplifier 21. It is composed of a modulator 22 for modulating the signal, a transmission VCO (voltage controlled oscillator) 23 for generating a subcarrier, and a buffer amplifier 24 for amplifying and transmitting the modulated audio signal.

On the other hand, the reception unit 20R generates an intermediate frequency signal by synthesizing an RF amplifier 25 that receives a high frequency audio signal, a local oscillation circuit 26 that generates a local oscillation frequency signal, a high frequency audio signal and a local oscillation frequency signal. Mixer 27, intermediate frequency amplifier circuit 28 for amplifying the intermediate frequency signal, detection circuit 29 for detecting the amplified intermediate frequency signal to obtain a low frequency audio signal, and amplifying the detected low frequency audio signal for reception It is composed of an audio amplifier 30 which is supplied to the telephone body 10 as a voice signal, and a power switch circuit 31.

Each of the plurality (n) of sensor units 40 constitutes a pair of conversion units, each of which includes a light emitting unit 40T as an infrared light converting unit and a light receiving unit 40R as an audio signal converting unit. The light emitting unit 40T of each sensor unit outputs a drive signal for driving the light emitting element (LED) 42 in accordance with the transmission amplifier 41 that receives the modulated audio signal from the buffer amplifier 24 in parallel, and the modulated audio signal amplified by the transmission amplifier 41. It is composed of an LED drive circuit 43 for generating.

The light receiving unit 40R includes a light receiving element (PDD) 44 for photoelectrically converting the received infrared light, a bandpass filter 45 for removing an unnecessary component of the photoelectrically converted electric signal and outputting an audio signal, and this audio signal. It is composed of a buffer amplifier 46 for amplifying a signal, and a mixing circuit 47 for synthesizing with a voice signal from a light receiving section of another sensor section and transmitting a synthesized voice signal.

FIG. 2 is a block diagram of the handset 50 which is a child device. The handset 50 includes a receiver 50R, a transmitter 50T and a power supply 50P.

Further, the receiving section 50R receives the infrared light emitted from the sensor section 40 and converts it into a high frequency sound signal, a light receiving element 51, an RF amplifier 53 for amplifying the high frequency sound signal, and a local oscillation frequency signal. A local oscillator circuit 54 for generating, a mixer 55 for combining the high frequency sound signal and the local oscillator frequency signal to generate an intermediate frequency signal, an intermediate frequency amplifier circuit 56 for amplifying the intermediate frequency signal, and detecting the amplified intermediate frequency signal. A detection circuit 57 for obtaining a low-frequency audio signal, an audio amplifier 58 for amplifying the detected low-frequency audio signal and transmitting a reception voice signal, a speaker 59 for receiving the reception voice signal and converting it into a voice, and a reception state. Is formed by a reception level detection circuit 60 which detects the signal and generates a detection signal.

Further, the transmitting unit 50T includes a microphone 61 that receives voice and converts it into a voice signal, an audio amplifier 62 that amplifies this voice signal, and a modulation that modulates the amplified voice signal to generate a modulated voice signal. A circuit 63, a transmission VCO 64 that generates a subcarrier, a transmission amplifier 65 that amplifies a modulated voice signal, an LED drive circuit 66 that generates a drive signal according to the amplified modulated voice signal, and infrared light by this drive signal. It is composed of a light emitting element 67 for emitting

The power supply unit 50 P is composed of a battery 68 that supplies power to the entire handset 50, a main switch 69, and a power supply switch circuit 70.

Next, the operation of the wireless telephone device shown in FIGS. 1 and 2 will be described.

First, when the telephone body 10 supplies the receiving voice signal received from the external communication line via the antenna 11 to the transmitting unit 20T, the modulated voice signal is transmitted to the light emitting units 40T of the plurality of sensor units 40. Is supplied to. Then, infrared light is emitted from the light emitting element 42 of each light emitting unit 40T. When the plurality of sensor units 40 are installed, the handset 50 is installed at an appropriate position and direction so that the infrared light emitting directions are different from each other. It becomes possible to receive light.

The handset 50, which has received the infrared light that carries the receiving voice from the parent device, transmits the receiving voice from the speaker 59 by performing predetermined signal processing such as photoelectric conversion, amplification, and detection. You can At this time, the main switch 69 is turned on, and the receiving power is constantly supplied from the battery 68 to the receiving section 50R. However, while the infrared light from the master unit does not arrive, the power supply switch circuit 70 that relays power to the transmitter 50T causes the power amplifier 65 for transmission and the LED drive circuit 66, which consume a large amount of power, to transmit power to the transmitter. Not supplied. In this case, the reception level detection circuit 60 detects the level of the reception voice signal from the intermediate frequency amplification circuit 56 and determines whether or not it is in the reception state, that is, whether or not the reception voice signal has arrived from the master unit. Determine whether. In the reception state, the detection signal is supplied to the power switch circuit 70 to turn on the transmission power, so that the handset 50 can respond and transmit.

By performing such power supply control, when the handset 50 is not in the transmission state, the transmission power supply is turned off to avoid unnecessary consumption of the battery 68 and to maintain its life long. Needless to say, when a call is made from the handset 50 to an external communication line, the transmission power is turned on even if the handset 50 is not in the receiving state.

When making a call from the handset 50 and transmitting, a voice signal from the microphone 61 is amplified and modulated, and infrared light is emitted from the light emitting element 67 to the master unit. In the plural sensor units 40 of FIG. 1, the output signals are combined by the mixing circuit 47 regardless of whether the infrared light from the handset 50 is received. In this case, by setting the frequency of the sub-carrier low, it is possible to suppress the interference of the output signals from the two or more sensor units 40.

For example, when the subcarrier is 2 MHz, the radio wave propagation speed is 300,000 km / s, so the wavelength is about 150 m, and the phase error is about 1% at about 2 m of the vehicle interior dimension, Even if it is mixed, its influence is small.

A method of avoiding interference is also possible by providing signal selecting means for automatically selecting the light receiving signal of the maximum level among the plurality of sensor sections without mixing.

In the case of the above power supply control, the level of infrared light may be detected to determine whether or not it is in the receiving state. In short, in the schematic block diagram of the handset 80 shown in FIG. 3, a general handset including an infrared light receiving portion 81, a receiver 82, a speaker 83, a microphone 84, a transmitter 85, an infrared light emitting portion 86 and a battery 87. In addition, a reception level detection circuit 88 as a reception detection means and a switch circuit 89 as a power supply control means are newly provided, and when the infrared light does not arrive from the master unit, that is, when it is not in the reception state, the handset 80 The power supply to the infrared light emitting unit 86, which consumes a large amount of power, may be stopped except when the call is issued from the. When not in the receiving state, not only the infrared light emitting unit 86 but also the power supply to the transmitter 85 may be stopped.

FIG. 4 is a diagram showing a configuration of a wireless car telephone when two sensor units are provided. In FIG. 4A, two sensor parts 91 and 92 similar to the sensor part 40 of FIG. 1 are installed in the upper front part of the vehicle 90. A movable handset 93 is provided in the same vehicle. Infrared light is used for communication between the sensor units 91 and 92 and the handset 93, and the communicable area (hereinafter referred to as “zone”) is shown in FIG. That is, as shown in FIG. 4A, the zone z1 of the sensor unit 91 has a directivity that spreads in a certain direction, and the zone z2 of the sensor unit 92 has a directivity that spreads in a direction different from that of the sensor unit 91. Hold.

For example, when the person in the driver's seat uses the handset 93, the handset 93 is in the position and direction of A shown in FIG. 4A, and the zone z3 of the handset 93 in this case is the sensor section 92. Has a directivity that spreads in the direction of. Further, the directivity of the zone z3 in the vertical direction is as shown in FIG. 4 (b). In such a case, good communication can be performed by communicating between the base unit (not shown) and the handset 93 via the sensor unit 92.

On the other hand, when the passenger in the passenger seat uses the handset 93, the position is the position and direction of B in FIG. 4A, and the directivity of the zone z3 in this case is as shown by the dotted line. , And has a directivity that spreads in the direction of the sensor unit 91. In this case, the handset 93 can communicate with the master unit via the sensor unit 91 to make a good call with an external line. Not only in the driver's seat or the passenger's seat, but also in the case of being used by a person in the rear seat, the handset 93 should be used at any position covered by the zones z1 and z2 of the two sensor units 91 and 92. You can

As described above, by installing a plurality of sensor units inside the vehicle, communication can be performed over the entire range of the inside of the vehicle, so that the handset can be used at any position and direction.

Although the embodiment shown in FIG. 4 has been described for use in a passenger car, it goes without saying that the wireless telephone device of the present invention can be applied to large vehicles such as buses, trains, ships and other moving bodies. Is. In such a case, by installing two or more sensor units, the handset can be used in a wide range. Conversely, even if only one sensor unit is installed, it is sufficient if the handset can be used in the communication area without any trouble.

Further, the present invention can be applied not only to mobile objects but also to buildings such as buildings and factories. In this case, many sensor units are installed, but the present invention using infrared light as a communication medium is applied. Does not need to be equipped with an antenna for these sensors, so it does not spoil the aesthetics of the room.

[0030]

[Effect of the device]

 As described above, the wireless telephone device according to the present invention interposes the sensor unit in the communication between the master unit and the slave unit, and uses infrared light as the communication medium between the sensor unit and the slave unit. This eliminates the drawback of sound quality deterioration due to the inclusion of vehicle ignition noise and other pulse noise, and the mutual interference with equipment using the same type of communication system. It has the effect of eliminating the interference caused by the long distance, and also has the effect of allowing the use of the slave unit at any position.

Further, when there is no transmission from the parent device, the battery life of the child device can be extended by controlling the power supply to the transmitting unit of the child device and the portion of the transmitting unit that consumes particularly high power. Have an effect.

[Brief description of drawings]

FIG. 1 is a block diagram of a master unit and a sensor unit of a wireless telephone device of the present invention.

FIG. 2 is a block diagram of a slave unit of the wireless telephone device of the present invention.

FIG. 3 is a schematic block diagram of a slave unit of the wireless telephone device of the present invention.

FIG. 4A is a plan view of the wireless telephone device of the present invention installed in a vehicle. (B) is a side view of the wireless telephone device of the present invention installed in a vehicle.

[Explanation of symbols]

 10 telephone body 20 wireless unit 40 sensor unit 40T light emitting unit 40R light receiving unit 50 handset 50R receiving unit 50T transmitting unit 50P power supply unit 60 reception level detection circuit 68 battery 70 power supply switch circuit

Claims (3)

[Scope of utility model registration request] 1. A master unit for performing telephone communication with the outside through a communication line, an infrared light converting unit for converting a voice signal output from the master unit into infrared light and emitting the infrared light in a predetermined direction, and the infrared light. A handset having a receiving means for receiving the infrared light emitted from the converting means and converting it into a receiving voice signal and a transmitting means for converting the transmitting voice signal into infrared light and emitting the infrared light, and an infrared ray emitted from the handset A wireless telephone device comprising: a light signal receiving unit that receives light in a receiving area, converts the light into a voice signal for reception, and supplies the voice signal to the master unit. 2. The reception unit, which detects whether or not the slave unit is in the reception state by the infrared light from the master unit or a reception voice signal converted from the infrared light, and when the reception state is not the reception state. 2. The wireless telephone device according to claim 1, further comprising: a power supply control unit that controls the supply of power to the transmission unit except when it transmits by itself. 3. The wireless telephone device according to claim 1, wherein the infrared light conversion means and the voice signal conversion means constitute an integrated conversion means forming a communication area as a pair.